Add nodeSelector to list of Chart Parameters

[darktempla]

Is your feature request related to a problem? Please describe.

No

Describe the solution you would like

I would like the ability to set via the chart values a nodeSelector for each of the individual pods.
The main one is Conjur as it does not support multi-arch.
Nginx and Postgres do so this is less important but for consistency would be good.

Alternatively node affinity would also do the trick but would be more complex from a templating point of view and overkill for my use case, however may future proof the change.

Describe alternatives you have considered

ARM based images then the node selector is not required however still a nice touch.

With everything going ARM before too long I suspect that will be a feature request. In particular all new Mac's.
ARM64 is the most prudent however support for linux/arm/v7 would be greatly appreciated too as it means users can make use of hybrid clusters that may contain older Raspberry Pi's etc.

Additional context

None